This is the Wacker Neuson factory service manual for the ET18, ET20, and ET24 track excavators, also sold under the type numbers E12-02, E12-03, and E12-04, document 1000282523. The 290 page manual covers the 3TNV76-SNSE12 and 3TNV80F-SSNS1 diesel engines fitted to these mini excavators.
Chapters run through machine operation, technical data, maintenance, the engine, the hydraulic system, the electrical system, optional equipment such as the grab control and hydraulic quickhitch circuits, and the PowerTilt PTS4.5 attachment.
Independent technicians and owners use this PDF to check and adjust valve clearance, torque the cylinder head, set hydraulic operating pressures, trace electrical faults, service the quick coupler, and keep to the correct filter and service intervals. Specifications, wear tolerances, and torque figures are listed for each system so repairs are done to the factory standard.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Operation | 12-41 | Information on This Service Manual, Identification of Warnings and Dangers, Explanation of Symbols and Abbreviations (Conversion Table), Designated Use and Exemption From Liability |
| Technical Data | 42-59 | Models and Trade Names, Engine, Engine Capacities, Traveling drive/axles, Tires/tracks (Rubber Tracks), Fuel Injection Pump, Coolant, Compound Table |
| Maintenance | 60-131 | Information on Maintenance (Responsibilities and Prerequisites, Important Safety Instructions on Maintenance), Service Package |
| Engine | 132-167 | Engine 3TNV76-SNSE12, Checking and Adjusting Valve Clearance, Tightening Order for Cylinder Head Bolts |
| Hydraulic System | 168-205 | Hydraulic Pump, Summation Control P1 – P3, Exploded View of Hydraulic Pump, Pilot Oil Supply Unit, Dismantling the Hydraulic Pump, Assembling the Hydraulic Pump, Main Valve Block |
| Electrical System | 206-251 | Ohm's Law; Power, Measuring Equipment, Measuring Methods, Relays (Use, Mode of Function), Electric Units, Fuses/relays, Alternator, Starter |
| Options | 252-271 | Automatic Engine Speed Setting, Grab Control Circuit, Hydraulic Easy Lock Quickhitch (Hydraulic Quickhitch Pressure Variants), 3Rd Control Circuit (Function) |
| PowerTilt PTS4.5 | 272-290 | Checking the Product, Decompression Valve, Testing the Hydraulic System of the Machine, Specifications/requirements, Tools (Making a Tool for Removing the Seals) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ET18, ET20, ET24 | ||
| Swivel joint torque | 64 Nm (47 ft.lbs.) | p. 200 |
| All Models | ||
| Hydraulic hose replacement interval | every 6 years | p. 114 |
| Joint rod maximum wear tolerance | 5 % (max. tolerance) | p. 123 |
| Air filter replacement interval | every 1000 o/h or once a year at the latest | p. 66 |
| Hydraulic oil filter insert replacement interval (normal work) | first time after 50 o/h, then every 500 o/h | p. 62 |
| Pressure drop for variable displacement pump P1 (diagnostic limit) | not more than 10 % of the maximum value | p. 102 |
| Pressure drop for variable displacement pump P2 (diagnostic limit) | not more than 10 % of the maximum value | p. 103 |
| Engine Power | 13.4 kW at 2200 rpm (18 hp at 2200 rpm) | p. 43 |
| Engine Idling Speed | 1300 +/− 25 rpm | p. 43 |
| PowerTilt PTS4.5 | ||
| PowerTilt minimum hose/pipe size | 6 mm (0.23 in) | p. 274 |
| ET18 – ET24 | ||
| Joint rod nominal size A | 32 mm (1 1/4 in) | p. 123 |
| all (from 2012 engine) | ||
| Engine Displacement | 1266 cm³ (77.3 in³) | p. 43 |
